Taper-thread-cutting machine.



W/TNEssEs W. W. VOSPER.

TAPER THREAD CUTTING MACHINE.

APPLICATION TILED SEPT. 23. 1907.

PATENTED JAN. 7, 1908.

//v VEN 70R.

i) ililifilli C iihilll lilo TAPER-THRE AD-CUTTIN G EIACELINE Specification of Letters Patent.

Patented Jan. '7', 1906.

Application tiled September 23. 1907. Serial lio- 39LO7E3- 1i 0 all whom Iii may concern:

Be it known that l, \'Y1,LL1.\i\i "W. Vosrnu, a citizen of the United States, andresident ol Toledo, in the county of Lucas and State of @hio, have inventeda certain new and useful Taper lhrea-tl-Ctitling Machine; and I do hereby declare the following to be a full, clear, and exact description oi the invention, such as will enable others skilled in lhe art to which it appertains to make and use the same, reference being had to the accompany ing drawings, and to the "figures of reference marked thereon, which form a part of this speriiio tion.

This nrvention relates to machines for use in cutting screwthreads on metallic pipes or other cylindrical objects, and piu'ticularlv to that class of apparatus designed for the cutting of taper threads and which have a guide-part to h ld the work and a head lll0V- able relative thereto and carrying a series of rznliallvamwable dies or chascrs for cutting the threads.

The. primary object of my invention is the provision of a simple, cheap and highly ellicieut machine of this class, which capable of being easily and quickly adj Listed to adapt it to cut threads on several dill'erent sizes of pipe 'WitllOillJ ohano thereof.

Ti opezatim construction and arrangm inentol the parts oi the invention are fully described in lln, following specification, and

- apreicrred ernlioilimeut thereof illustrated in the aneompanying drmvings, in Which,-

Figure l. a lop plan view of the face or die-carrying end of the machine comprising my invention, and Fig. 2 is a contral'longitudinal section of lhe same taken on the line y 3; in Fig. l.

iii ring the drawings, 1 designates a circular die-head having the cylindrical e);- tcneion 2, which is threaded to form the lead screws of the machine and 3 the ovlimlrical guide or work-holder, which is threaded to the ovlindrical extension 2, as shown, and carries set of set-screvvs l l'or clamping the guide to the work.

The die-head l is provided on its face with plurality of radial chaser s 5, preterahly formed in bosses or raised porlions 6 ol the head, as shown, and in oat-h oi these ways is mounted a radially nu rnhlc chaser or die 7, the inner end of which is intended to ingthe dies or chnsers project within the central work-opening of the head.

l'lnoirrlingr the die-lnnnl l is a c viimh'ical casing: 0 having its lower-or inner end terminatin e in an inturnod annular llnnge 10, which is rotatably supported upon a flange ll on the guide Cl and. is prevented irom longitudinal movement relative to the guide by the threading of a collar 12 lo the 0nd ol the guide above the llnngc ll. 'lhe casing 9 is thickened at points falling opposite the chasers 7, as at 123, and those thickened por lions are each l'ormcd on their inner surfaces with a series of grznluatwl steps H arranged circularly ol tlu casing and iuendod lo l'orn'i seals ngaiust \vhieh tho clmsers have their outward radial thrusts when cutting, a thread. The stops 14- extend longitudinally of the casing and each tapered lengilnviso thereof to rausc the cluisers having contact there with to have a gradual radial movement when the'die-hoad and guide have relative longitudinal movementsv 'lhe chasers are violdingly retained in their run-ways hy tho coaetion tl'icrr-u'ith of spring-pressed pins 15. Formed in direct opposition on the outer side -01 the casing" 12 are two sockets 16 into which the ends of handles may be secured to facilitate a turning of the casing.

in the operation of my device, the chaser-s are 'lirst adjusted so that their rear ends abut the steps 14 suited to the size of the pipe or other object to he threaded, and the work is then passed. into the guide and. scoured by the set-screws 4. As the casing turned in the proper direction to out a thread the shoulders of the. steps '14 engaged by the chasers not on the side; of the chesers and cause the die-head to turn therewith. As the (liC-lltttll worli's into its guide lue to the action of the hmd-tinemls, tin.- outer chaser ends move longitudinally of the inclined surfaces of the enga ed steps and. cause the Chasers to have radial movements to out the threads on a taper in accord with the degree of inclination of such surfaces.

it is apparent that i have provided a cheap and simple thper-tlu'rad cutting; machine, the rlmscrs of which may be readily and easily ndjuslcd to operate on several dill'orcnt sizes ol' work by simply turning the casing relative to the iliwhoad until the chasers radiallv register desired ment therewith, thus obviating the replacing of parts or the manipulation of adjusting screws, which the constructions heretofore used have made necessary to adjust the chasers.

Having thus described my invention, what I claim as new and desire to secure y L tters Patent, is,-

1. In a screw thread-cutting apparatus, the combination with the die-head and workguide in screv-threaded en 'agernent with each other, of 'chasers radially movable in the head, and a member rotatably carried j by the work-guide and having chaser-engaging surfaces which are stepped in transverse relation to the member and inclined longitudinally of the head.-

2. The combination with the die-head and the guide threaded thereto, of radiallymovable chasers carried by the die-head, and means rotatably carried by the guide and having a set of chaser-engaging steps for each chaser, the steps of each set running circularly ofthe die-head and having their surfaces longitudinally inclined to eflect a radial movement of the cliasers when the die-head and guide have relative longitudinal movements, said means being adapted to turn with the head due to the engagement of the chaser ends with the ste s.

3. The combination with tie die-head, and the guideto which it is threaded, of

, radiallyanovabl chasers carried by the diehead with their outer ends protruding therel having its inner end contracted and journaled on the guide, said casing having stepped surfaces associated with each chaser,

and longitudinally inclined to cause the from, a casing encircling the di ehead and the steps of which are circularly arranged.

coacting chasers to move radially when the A In testimony whereof I have hereunto signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM W. VOSPER Witnesses:

WILBER A. OWEN, CORNELL SCHREIBER.

holder have relative longitudinal movements. 

